To coil, you don’t need much. Essentially, you need a coiling jig (micro coiler) to make it easier to wrap your wire to the required core size, sharp scissors for cutting cotton, and of course, a screwdriver or Allen key depending on what the tank needs, as well as wire cutters. I recommend reading this series [HALADÓ] 1. rész: Huzalok. If you’ve already read it, then review it again to refresh your memory. Your mod, which I think is good, depends on what you want to use it for, MTL or DL. But what I advocate is that more batteries are always better; if 2 batteries are working, it’s easier to build coils together than alone. However, others can recommend mods and tanks better 
I’m still getting acquainted with these myself. As for websites, I think the one that comes up most often or that I see recommended here is the panda site A&L, and what I gladly recommend, although their stock isn’t too large, is calumette.
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